package com.bjzspace.lwq.kafka.consumer;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.StringDeserializer;

import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

public class CustomConsumerAutoOffset {

    public static void main(String[] args) {
        // 0.定义配置
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.88.101:9092,192.168.88.102:9092");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        // 设置自动提交参数
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
        properties.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, 1000);
        // 配置消费者group.id
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "test");

        // 1.创建一个消费者
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);

        // 2.订阅主题
        List<String> topics = new ArrayList<>();
        topics.add("first");
        consumer.subscribe(topics);

        // 3.消费数据
        while (true) {
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofSeconds(1));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord);
            }

        }


    }

}
